HOW TO RETRIEVE THE TIME USING SQL STATEMENT

hello there,
can i retrieve only the 'time' from the datetime?

exmaple:
A datetime like '2004-09-02 13:42:002', i want to take out only the time '13:42:002'

is it possible to do this?
and some more i want to find out the difference between two date/datetime.
It can be done using DATEDIFF in SQL but it only give me the result in either hour or minute or second or m. Second.

I want to result to be something like this :-
The Difference between this two date is 1 hour 30 minutes 39 second OR 1:30:39

thanks you
josh
joshflyAsked:
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BlackTigerXConnect With a Mentor Commented:
you could use this:

select convert(varchar, getdate(), 8)

that will give you the time of the current date, of course you can replace getdate with any datetime field you have, and you can assign it to any variable, etc

declare @myvar datetime
set @myvar = convert(varchar, getdate(), 8) --extract the time
select convert(varchar, @myvar, 8) --show the time
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kretzschmarCommented:
1.TO_Char(DateTimeField,'HH:MI:SS');

2. Difference := DateTimeField1 - DateTimeField2;
whereas the frac part of the result is the time,
and the part before the decimal-delimiter are days

meikl ;-)
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Ferruccio AccalaiSenior developer, analyst and customer assistance Commented:
to get the time from a datetime you can use decodetime from sysutils

procedure TForm1.Button1Click(Sender: TObject);
var
 Year, Month, Day, Hour, Min, Sec, MSec: Word;
 begin
  DecodeTime(Now, Hour, Min, Sec, MSec);
end;
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kretzschmarCommented:
oops, sorry, i thought i was in the oracle topic

1. result := TimeToStr(DateField);

2. result := timetostr(DateField1-Datefield2);

meikl ;-)
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Ferruccio AccalaiSenior developer, analyst and customer assistance Commented:
mmm...
hi meikl, nice to see you :))

for 2 i'd do
 result := TimeToStr((SecondsBetween(datefield1,datefield2))/(60*60*24));
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VoodoomanCommented:
Hi

The sql depends what database you are using. What db is it?


Voodooman
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kretzschmarCommented:
good point, voodoo,

overlooked "USING SQL STATEMENT" myself
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Wim ten BrinkSelf-employed developerCommented:
In Delphi you can do simple math with the TDateTime values. The trunc(Now) part is the date-part while the Frac(Now) part is the time part. Something like:

Time3 := Abs(Frac(DateTime1) - Frac(DateTime2));

Then Time3 will be the difference between both times. Using FormatDateTime('HH:NN:SS', Time3) would then provide you the difference in hours, minutes and seconds.

But those are just the Delphi solutions. Solving this in SQL is a bit harder since it depends on the SQL dialect that you're using. SQL is a bit limited in the additional functions it provides. But if I'm not mistaken, many SQL databases do store date/time fields in the same way as Delphi: as floats...

But you might want a refund and re-ask this question in one of the Database-specific areas of EE. It has no relation to Delphi anyway.
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bpanaConnect With a Mentor Commented:
i assume you use SQL Server

declare @date1 datetime, @date2 datetime
declare @hh int, @mm int, @ss int
declare @datediffs int
set @date1 = '2004-09-02 13:42:002'
set @date2 = '2004-09-02 14:43:003'

set @datediffs = datediff(ss, @date1, @date2)
set @hh = round(@datediffs/3600, 0)
set @datediffs = @datediffs - @hh*3600
set @mm = round(@datediffs/60, 0)
set @datediffs = @datediffs - @mm*60
select cast(@hh as varchar(2)) + ':' + cast(@mm as varchar(2)) + ':' + cast(@datediffs as varchar(2))

the result is not nice, but you got the ideea, you can format it as you want
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joshflyAuthor Commented:
thanks guys,

:)
josh
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